I am trying to sell my old 1520 (i have a 1520.3 now) and most people want it unlocked. Unfortunately ATT will not unlock it for me since I switched to TMO. If any of you are out of contract, it is a really easy process. It takes about 5 minutes to key in a few things on their website:
https://forums.windowscentral.com/e...nt%2Fen_US%2FtermsAndCondition&token=TXfVcoW_
https://forums.windowscentral.com/e...nt%2Fen_US%2FtermsAndCondition&token=TXfVcoW_